Seoul International Marathon is an international competition with 20,000 participants. The course begins at Gwanghwamun Square Sageori (four-way intersection) and runs to Jamsil Olympic Main Stadium, covering a total distance of over 42.195km. The course allows participants to run across the entire area of Seoul.

At the same time, Seoul Challenge 10k will also be held so participants can choose the course that fits their ability.